Short answer: the Sony SS-CS5 M2 for room-filling use, the Neumi Silk 4 for nearfield listening. The Neumi pairs a 4” midwoofer with a 1” dome tweeter and waveguide on a second-order crossover, but its measured 82.6dB sensitivity rules out large rooms, far-field listening and high volume. The Sony’s added bracing and updated crossover reduce the resonance issues, though mild sibilance in the 3-5kHz range stands out on S and T sounds.
Buy the Neumi Silk 4. It is rated higher for sound quality than the Sony SS-CS5 M2 and costs less, so only choose the other one for a particular feature it does better.
Looking for alternatives? See the complete Passive Home rankings.
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Specifications Side By Side
| Neumi Silk 4 | Sony SS-CS5 M2 | |
|---|---|---|
| Price | $199.99 per pair | $278.00 per pair |
| Ranked | #58 of 179 in Medium Size Bookshelf Speakers | #93 of 179 in Medium Size Bookshelf Speakers |
| Bass Extension (-10dB) | 55Hz (measured, Erin’s Audio Corner) | 54Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 83Hz (measured, Erin’s Audio Corner) | 80Hz (measured, Erin’s Audio Corner) |
| Dimensions | 8.9”H x 5.5”W x 8.2”D (226.1 x 139.7 x 208.3 mm) | 13.2”H x 7”W x 8.7”D (335 x 178 x 220 mm) |
| Impedance | 6 ohms nominal, 5.7 ohms minimum (measured, Erin’s Audio Corner) | 6 ohms |
| Sensitivity | 82.6dB (measured, Erin’s Audio Corner) | 82.5dB |
| Drivers | 4” treated paper cone, rubber surround, cast aluminum basket, vented pole woofer, 1” silk dome, dispersion-optimized waveguide, neodymium magnet tweeter | 5.12” woofer, 0.98 in tweeter; 0.75-inch supertweeter; 0.75-inch supertweeter; 0.75-inch supertweeter; 0.75-inch supertweeter |
| Weight | 6.2 lbs (2.8 kg) each | 9.5 lbs (4.3 kg) each |
| Woofer Cabinet | ported, rear | ported, rear |
| Spinorama Preference Score | 4.44 | - |
| Spinorama Preference Score with Perfect Sub | 7.10 | - |
| DIY Kit | No | No |
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